Group numerical data into class intervals

Here are the values of the number of pages in novels borrowed from a library, for a sample of 40: 171, 223, 123, 142, 112, 222, 151, 162, 157, 129, 189, 152, 150, 218, 187, 154, 127, 123, 215, 113, 129, 195, 108, 224, 125, 158, 124, 180, 125, 105, 224, 148, 183, 154, 148, 212, 153, 101, 196, 107

All listed values are whole numbers. Each interval includes both written endpoints; the next whole number starts the next interval

Use class intervals of width 25, starting at 100: 100–124, 125–149, 150–174, 175–199, 200–224